Parameters of coaxial cable
1. Main electrical parameters
(1), the characteristic impedance of the coaxial cable The average characteristic impedance of the coaxial cable is 50 ± 2Ω, the periodic change of the impedance along the single coaxial cable is a sine wave, the center average value is ± 3Ω, and its length is less than 2 meters.
(2) The attenuation of the coaxial cable generally refers to the attenuation value of the cable section of 500 meters long. When measured with a 10MHz sine wave, its value does not exceed 8.5db (17db / km); while measured with a 5MHz sine wave, its value does not exceed 6.0db (12db / km).
(3) The minimum propagation speed required for the propagation speed of the coaxial cable is 0.77C (C is the speed of light).
(4) The sum of the resistance of the center conductor of the coaxial cable DC loop resistance cable and the resistance of the shielding layer does not exceed 10 milliohms / meter (measured at 20 ° C).
2. Physical parameters of the coaxial cable The coaxial cable is composed of a center conductor, a layer of insulating material, a shielding layer composed of a mesh fabric, and an external insulating material layer.
The coaxial cable is flexible enough to support a bending radius of 254mm (10 inches). The center conductor is a solid copper wire with a diameter of 2.17 mm ± 0.013 mm. The insulation material must meet the electrical parameters of the coaxial cable. The shielding layer is composed of metal strips or sheets that meet the transmission impedance and ECM specifications. The inner diameter of the shielding layer is 6.15mm and the outer diameter is 8.28mm. The external insulation material is generally selected from polyvinyl chloride (such as PVC) or similar materials.
3. The main parameters for testing the cable are:
(1) Open circuit of conductor or shielding layer.
(2) Short circuit between conductor and shield.
(3) Conductor grounding.
(4) Short circuit between shielding connectors.
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